Started tidying up bus instantiation.
Major-ish bus construction refactor. Still not nice, but less icky than it was.
Merge branch 'master' of github.com:DamianMac/Nimbus

Conflicts:
	src/Nimbus.IntegrationTests/WhenPublishingAnEvent.cs
	src/Nimbus.IntegrationTests/WhenSendingACommandOnTheBus.cs
	src/Nimbus.IntegrationTests/WhenSendingARequestOnTheBus.cs
	src/Nimbus/Bus.cs
Fixed merge conflicts around QueueManager.